Before: runtime! ale_linters/markdown/textlint.vim After: call ale#linter#Reset() Execute(textlint handler should handle errors output): AssertEqual \ [ \ { \ 'lnum': 16, \ 'col': 50, \ 'text': 'Found possibly misspelled word "NeoVim".', \ 'type': 'W', \ 'code': 'preset-japanese/no-doubled-joshi', \ }, \ ], \ ale#handlers#textlint#HandleTextlintOutput(bufnr(''), [ \ '[', \ ' {', \ ' "filePath": "test.md",', \ ' "messages": [', \ ' {', \ ' "type": "lint",', \ ' "ruleId": "preset-japanese/no-doubled-joshi",', \ ' "index": 1332,', \ ' "line": 16,', \ ' "column": 50,', \ ' "severity": 2,', \ ' "message": "Found possibly misspelled word \"NeoVim\"."', \ ' }', \ ' ]', \ ' }', \ ']', \ ]) Execute(textlint handler should no error output): AssertEqual \ [], \ ale#handlers#textlint#HandleTextlintOutput(bufnr(''), [ \ ])